1
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Yisimayili N, Lu CD. Stereoselective Construction of Less-Accessible Acyclic α,α-Disubstituted β-Ketiminonitriles via Electrophilic Cyanation of β,β-Disubstituted Enesulfinamides. Org Lett 2024; 26:4371-4376. [PMID: 38752686 DOI: 10.1021/acs.orglett.4c01409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2024]
Abstract
The metalloenamines, formed by NH-deprotonation of β,β-disubstituted enesulfinamides, can undergo reactions with commercially available electrophilic cyanating reagents such as tosyl cyanide (TsCN) or 3-oxo-1,2-benziodoxole-1(3H)-carbonitrile (CBX). Through the utilization of appropriate stereoisomers of enesulfinamides, this method enables the selective synthesis of any of the four stereoisomers of α,α-disubstituted β-sulfinylimino nitriles, which feature acyclic quaternary stereocenters and are typically more challenging to synthesize. These compounds can then undergo stereoselective nucleophilic addition, leading to the creation of valuable enantioenriched multisubstituted β-amino carbonyl surrogates with a high degree of structural diversity.
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Affiliation(s)
| | - Chong-Dao Lu
- School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
- School of Health, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
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2
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Xiong TZ, Yisimayili N, Lu CD. Stereoselective Electrophilic Chlorination of β,β-Disubstituted Enesulfinamides with Chloramine-T: Asymmetric Synthesis of Acyclic α,α-Disubstituted α-Chlorinated Carbonyl Surrogates. Org Lett 2024; 26:1851-1856. [PMID: 38386702 DOI: 10.1021/acs.orglett.4c00059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2024]
Abstract
Enamine and iminium ion-mediated asymmetric organocatalysis was not successful in achieving highly stereoselective α-chlorination of acyclic α,α-disubstituted carbonyls. To address this limitation, an alternative method was developed, which involved the use of geometry-defined persubstituted enesulfinamides to intercept the electrophilic chlorinating reagent. This approach enables the asymmetric construction of challenging acyclic α,α-disubstituted α-chlorinated ketimines with a high degree of stereoselectivity. The use of chloramine-T, a cost-effective and stable chlorine source rarely utilized in asymmetric electrophilic chlorination, plays a crucial role in achieving superior stereocontrol.
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Affiliation(s)
- Teng-Zhao Xiong
- School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
| | | | - Chong-Dao Lu
- School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
- School of Health, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
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3
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Yisimayili N, Zhu CL, Liu T, Yao Y, Lu CD. Stereoselective Construction of Acyclic β,β-Disubstituted Enesulfinamides via Conjugate Addition of Organocuprates to α-Substituted α,β-Unsaturated N-Sulfinyl Ketimines. Org Lett 2023; 25:5536-5541. [PMID: 37458358 DOI: 10.1021/acs.orglett.3c02060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/29/2023]
Abstract
In the presence of boron trifluoride, conjugate addition of organocuprates to α-substituted α,β-unsaturated N-tert-butanesulfinyl ketimines provides facile access to acyclic β,β-disubstituted enesulfinamides with high ratios of geometric isomers. Diverse and challenging to synthesize, multisubstituted aza-enolates bearing two electronically and sterically similar β-substituents, which are important precursors for asymmetric construction of the less accessible acyclic quaternary or tetrasubstituted stereocenters at the α-position of ketimines, can be efficiently prepared in good yields with high stereocontrol.
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Affiliation(s)
| | - Chong-Lin Zhu
- School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
- Southwest United Graduate School, Kunming, Yunnan 650092, China
| | - Tao Liu
- School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
| | - Yun Yao
- School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
| | - Chong-Dao Lu
- School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
- Southwest United Graduate School, Kunming, Yunnan 650092, China
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4
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Li JR, Yao Y, Lu CD. Stereoselective Synthesis of Less Accessible α-Tertiary Amino Ketimines via Electrophilic Amination of α-Branched N- tert-Butanesulfinyl Ketimines. Org Lett 2023; 25:3670-3675. [PMID: 37171378 DOI: 10.1021/acs.orglett.3c01056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
A stereocontrolled electrophilic amination of α-branched N-tert-butanesulfinyl ketimines was developed to construct α-aminoketone derivatives containing less accessible α-tetrasubstituted stereocenters. Stereospecific α-deprotonation of ketimines with potassium tert-butoxide gave stereodefined metalloenamine intermediates that could act as nucleophiles to attack azodicarboxylic derivatives, affording α-aminated products in high yields with excellent stereoselectivities.
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Affiliation(s)
- Jin-Rui Li
- School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Yun Yao
- School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Chong-Dao Lu
- School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
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5
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Zhu CL, Yao Y, Lu CD. Stereocontrolled α-Allylation of α-Branched N- tert-Butanesulfinyl Ketimines via a Michael-Wittig Cascade for the Construction of Acyclic Quaternary Stereocenters. Org Lett 2022; 24:8925-8929. [PMID: 36445047 DOI: 10.1021/acs.orglett.2c03801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
A single-flask cascade of Michael addition and Wittig olefination was developed to allow the stereoselective α-allylic alkylation of α-branched N-tert-butanesulfinyl ketimines for the construction of acyclic quaternary stereocenters bearing two sterically and electronically similar substituents. In this process, tBuOK-promoted stereoselective α-deprotonation gives fully substituted aza-enolates with a stereodefined geometry, Michael addition with α,β-unsaturated phosphonates generates C-C bonds with exceptional stereocontrol, and finally paraformaldehyde trapping of the conjugate addition intermediate generates functionalized α-allylated imines.
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Affiliation(s)
- Chong-Lin Zhu
- School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
- Southwest United Graduate School, Kunming, Yunnan 650092, China
| | - Yun Yao
- School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
| | - Chong-Dao Lu
- School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
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6
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Chu LF, Yao Y, Lu CD. Stereoselective Electrophilic α-Alkynylation of α,α-Disubstituted N- tert-Butanesulfinyl Ketimines for Construction of Less Accessible Acyclic Quaternary Stereocenters. Org Lett 2022; 24:9135-9140. [DOI: 10.1021/acs.orglett.2c03865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Li-Feng Chu
- School of Chemical Science and Technology, Yunnan University, Kunming 650091, People’s Republic of China
| | - Yun Yao
- School of Chemical Science and Technology, Yunnan University, Kunming 650091, People’s Republic of China
| | - Chong-Dao Lu
- School of Chemical Science and Technology, Yunnan University, Kunming 650091, People’s Republic of China
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7
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Tavakoli A, Dudley GB. Synthesis of Coprinol and Several Alcyopterosin Sesquiterpenes by Regioselective [2 + 2 + 2] Alkyne Cyclotrimerization. J Org Chem 2022; 87:14909-14914. [PMID: 36215202 DOI: 10.1021/acs.joc.2c01741] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Alkyne [2 + 2 + 2] cyclotrimerization is a strategically attractive but tactically challenging approach to the synthesis of highly substituted benzene rings. Here, a bimolecular regioselective cyclotrimerization is applied to the total synthesis of the natural product coprinol and several related alcyopterosins from the illudalane family of sesquiterpenes. The synthesis of coprinol from dimedone was completed in six steps and a 57% overall yield. Alternative functional group manipulations lead to alcyopterosins A, B, and O and two additional congeners, all within six steps.
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Affiliation(s)
- Amir Tavakoli
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26505, United States
| | - Gregory B Dudley
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26505, United States
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8
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Oga M, Takamatsu Y, Ogura A, Takao KI. Asymmetric Synthesis of Cyclopentene Compounds Containing All-Carbon Quaternary Stereocenters by (3 + 2) Cycloaddition and Its Application in the Formal Synthesis of ( R)-(-)-Puraquinonic Acid. J Org Chem 2022; 87:8788-8795. [PMID: 35699729 DOI: 10.1021/acs.joc.2c00753] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A highly stereoselective (3 + 2) cycloaddition for the asymmetric synthesis of versatile cyclopentene compounds containing all-carbon quaternary stereocenters was developed. The phosphine-catalyzed reactions of alkynoates with α-alkylated electron-deficient alkenes bearing Oppolzer's camphorsultam showed high to excellent diastereoselectivities and perfect regioselectivities. The usefulness of this reaction was demonstrated in the concise formal synthesis of (R)-(-)-puraquinonic acid.
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Affiliation(s)
- Miho Oga
- Department of Applied Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Yusei Takamatsu
- Department of Applied Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Akihiro Ogura
- Department of Applied Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Ken-Ichi Takao
- Department of Applied Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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9
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Morales-Monarca G, Gnecco D, Terán JL. Diastereoselective Functionalization of chiral N‐acyl‐1,3‐oxazolidines and Their Applications in the Synthesis of bioactive molecules. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Gerardo Morales-Monarca
- Benemérita Universidad Autónoma de Puebla: Benemerita Universidad Autonoma de Puebla Science Institute MEXICO
| | - Dino Gnecco
- Benemérita Universidad Autónoma de Puebla: Benemerita Universidad Autonoma de Puebla Science Institute MEXICO
| | - Joel L. Terán
- Benem�rita Universidad Aut�noma de Puebla Laboratorio de S�ntesis Org�nica Avenida San Claudio, Colonia San ManuelEdificio IC-9 Complejo de Ciencias,Ciudad Universitaria 72570 Puebla MEXICO
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10
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Chen J, Shi Z, Lu P. Enantioselective Synthesis of Indanes with a Quaternary Stereocenter via Diastereoselective C(sp 3)-H Functionalization. Org Lett 2021; 23:7359-7363. [PMID: 34506151 DOI: 10.1021/acs.orglett.1c02513] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A practical synthesis of enantioenriched indane derivatives with quaternary stereocenters was developed via sequential enantioselective reduction and C-H functionalization. Good to excellent enantioselectivity could be achieved by either the CuH-catalyzed asymmetric reduction or the Corey-Bakshi-Shibata (CBS) reduction of indanone derivatives. The subsequent diastereospecific and regioselective rhodium-catalyzed silylation of the methyl C-H bond led to indane derivatives with quaternary centers. This strategy was further applied in syntheses of (nor)illudalane and botryane sesquiterpenoids.
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Affiliation(s)
- Jun Chen
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University, 220 Handan Lu, Shanghai 200433, P. R. China
| | - Zhan Shi
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University, 220 Handan Lu, Shanghai 200433, P. R. China
| | - Ping Lu
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University, 220 Handan Lu, Shanghai 200433, P. R. China
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11
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Jancarik A, Khanh Hung N, Skidin D, Moresco F, Gourdon A. Preparation of Tetrabenzo[4.4.2]undecastarphene by On-Surface Synthesis. Chempluschem 2021; 86:991-996. [PMID: 33928767 DOI: 10.1002/cplu.202100112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 04/13/2021] [Indexed: 11/06/2022]
Abstract
A large dissymmetric starphene molecule, the tetrabenzo[a,c,u,w]naphtho[2,3-l]nonaphene, was obtained by first preparing a soluble precursor which was then sublimated on a Au(111) surface in an ultra-high vacuum. In a second step, controlled annealings from 200 °C to 275 °C initiated two successive cyclodehydrogenation steps with the formation of 3 new carbon-carbon bonds. A second conformer was also stable enough during the annealing step to give another compound in similar yield, the benzodibenzo[7,8,9,10]naphthaceno[2,1-h]phenanthro[9,10-p]hexaphene. The formation of this more-hindered species stresses the importance of strong molecule-surface interactions during the cyclodehydrogenations steps of these large polyaromatic hydrocarbons.
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Affiliation(s)
- Andrej Jancarik
- CEMES-CNRS, 29, rue Jeanne Marvig, 31055, Toulouse Cedex 04, France.,Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, 166 10 Prague 6, Czech Republic
| | | | - Dmitry Skidin
- Center for Advancing Electronics Dresden, TU Dresden, 01069, Dresden, Germany
| | - Francesca Moresco
- Center for Advancing Electronics Dresden, TU Dresden, 01069, Dresden, Germany
| | - Andre Gourdon
- CEMES-CNRS, 29, rue Jeanne Marvig, 31055, Toulouse Cedex 04, France
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12
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Liao Y, Zhou Y, Zhang Z, Fan J, Liu F, Shi Z. Intramolecular Oxidative Coupling between Unactivated Aliphatic C-H and Aryl C-H Bonds. Org Lett 2021; 23:1251-1257. [PMID: 33555883 DOI: 10.1021/acs.orglett.0c04239] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Direct oxidative coupling of different inert C-H bonds is the most straightforward and environmentally benign method to construct C-C bonds. In this paper, we developed a Pd-catalyzed intramolecular oxidative coupling between unactivated aliphatic and aryl C-H bonds. This chemistry showed great potential to build up fused cyclic scaffolds from linear substrates through oxidative couplings. Privileged chromane and tetralin scaffolds were constructed from readily available linear starting materials in the absence of any organohalides and organometallic partners.
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Affiliation(s)
- Yang Liao
- Department of Chemistry, Fudan University, Shanghai 200438, China
| | - Yi Zhou
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai 201418, China
| | - Zhen Zhang
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai 201418, China
| | - Junzhen Fan
- Department of Chemistry, Fudan University, Shanghai 200438, China
| | - Feng Liu
- Department of Chemistry, Fudan University, Shanghai 200438, China.,School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai 201418, China
| | - Zhangjie Shi
- Department of Chemistry, Fudan University, Shanghai 200438, China.,State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Shanghai 200032, China
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13
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Zhuang Z, Herron AN, Liu S, Yu JQ. Rapid Construction of Tetralin, Chromane, and Indane Motifs via Cyclative C-H/C-H Coupling: Four-Step Total Synthesis of (±)-Russujaponol F. J Am Chem Soc 2021; 143:687-692. [PMID: 33395528 DOI: 10.1021/jacs.0c12484] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The development of practical C-H/C-H coupling reactions remains a challenging yet appealing synthetic venture because it circumvents the need to prefunctionalize both coupling partners for the generation of C-C bonds. Herein we report a cyclative C(sp3)-H/C(sp2)-H coupling reaction of free aliphatic acids enabled by a cyclopentane-based mono-N-protected β-amino acid ligand. This reaction uses inexpensive sodium percarbonate (Na2CO3·1.5H2O2) as the sole oxidant and generates water as the only byproduct. A range of biologically important scaffolds, including tetralins, chromanes, and indanes, can be easily prepared by this protocol. Finally, the synthetic application of this methodology is demonstrated by the concise total synthesis of (±)-russujaponol F in a four-step sequence starting from readily available phenylacetic acid and pivalic acid through sequential functionalizations of four C-H bonds.
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Affiliation(s)
- Zhe Zhuang
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Alastair N Herron
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Shuang Liu
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Jin-Quan Yu
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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14
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Gaston R, Geldenhuys WJ, Dudley GB. Synthesis of Illudinine from Dimedone and Identification of Activity as a Monoamine Oxidase Inhibitor. J Org Chem 2020; 85:13429-13437. [PMID: 32830978 DOI: 10.1021/acs.joc.0c01301] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The fungal metabolite illudinine is prepared in seven steps and ca. 55% overall yield from dimedone using an "open and shut" (ring-opening and ring-closing) strategy. Tandem ring-opening fragmentation and olefination of dimedone establishes alkyne and vinylarene functionality linked by a neopentylene tether. Oxidative cycloisomerization then provides the illudinine framework. The key innovation in this second-generation synthesis of illudinine is the use of the nitrile functional group, rather than an ester, as the functional precursor to the carboxylic acid of illudinine. The small, linear nitrile (C≡N) is associated with improved selectivity, π-conjugation, and reactivity at multiple points in the synthetic sequence relative to the carboxylic acid ester. Preliminary assays indicate that illudinine and several related synthetic analogues are monoamine oxidase inhibitors, which is the first reported indication of biological activity associated with this natural product. Illudinine was found to inhibit monoamine oxidase B (MAO-B) with an IC50 of 18 ± 7.1 μM in preliminary assays.
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15
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Affiliation(s)
- Amir Tavakoli
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26505, United States
| | - Gregory B. Dudley
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26505, United States
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16
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Hoveyda AH, Liu Z, Qin C, Koengeter T, Mu Y. Impact of Ethylene on Efficiency and Stereocontrol in Olefin Metathesis: When to Add It, When to Remove It, and When to Avoid It. Angew Chem Int Ed Engl 2020; 59:22324-22348. [DOI: 10.1002/anie.202010205] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Revised: 09/02/2020] [Indexed: 12/24/2022]
Affiliation(s)
- Amir H. Hoveyda
- Department of Chemistry Merkert Chemistry Center Boston College Chestnut Hill MA 02467 USA
- Supramolecular Science and Engineering Institute University of Strasbourg CNRS 67000 Strasbourg France
| | - Zhenxing Liu
- Supramolecular Science and Engineering Institute University of Strasbourg CNRS 67000 Strasbourg France
| | - Can Qin
- Department of Chemistry Merkert Chemistry Center Boston College Chestnut Hill MA 02467 USA
| | - Tobias Koengeter
- Department of Chemistry Merkert Chemistry Center Boston College Chestnut Hill MA 02467 USA
| | - Yucheng Mu
- Department of Chemistry Merkert Chemistry Center Boston College Chestnut Hill MA 02467 USA
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17
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Hoveyda AH, Liu Z, Qin C, Koengeter T, Mu Y. Impact of Ethylene on Efficiency and Stereocontrol in Olefin Metathesis: When to Add It, When to Remove It, and When to Avoid It. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202010205] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Amir H. Hoveyda
- Department of Chemistry Merkert Chemistry Center Boston College Chestnut Hill MA 02467 USA
- Supramolecular Science and Engineering Institute University of Strasbourg CNRS 67000 Strasbourg France
| | - Zhenxing Liu
- Supramolecular Science and Engineering Institute University of Strasbourg CNRS 67000 Strasbourg France
| | - Can Qin
- Department of Chemistry Merkert Chemistry Center Boston College Chestnut Hill MA 02467 USA
| | - Tobias Koengeter
- Department of Chemistry Merkert Chemistry Center Boston College Chestnut Hill MA 02467 USA
| | - Yucheng Mu
- Department of Chemistry Merkert Chemistry Center Boston College Chestnut Hill MA 02467 USA
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18
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Khan I, Zaib S, Ibrar A. New frontiers in the transition-metal-free synthesis of heterocycles from alkynoates: an overview and current status. Org Chem Front 2020. [DOI: 10.1039/d0qo00698j] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This review highlights the successful utilization of transition-metal-free approaches for the modular assembly of various heterocycles from alkynoates.
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Affiliation(s)
- Imtiaz Khan
- Department of Chemistry
- School of Natural Sciences
- The University of Manchester
- Manchester M13 9PL
- UK
| | - Sumera Zaib
- Department of Biochemistry
- Faculty of Life Sciences
- University of Central Punjab
- Lahore-54590
- Pakistan
| | - Aliya Ibrar
- Department of Chemistry
- Faculty of Natural Sciences
- The University of Haripur
- Haripur, KPK-22620
- Pakistan
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